The most abundant isotope of hydrogen, H 1, with atomic mass 1.
'氘'.''''.'氢'.''的数量最丰富的一种同位素, h1, 原子质量为1.
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Early chemists had to use indirect means for determining the atomic mass of an element.
早先的化学家只得用间接的方法来确定某种元素的原子质量.
辞典例句
The elements, if arranged according to their atomic mass, exhibit an evident periodicity of properties.
元素, 如果按照他们的原子质量来安排, 则它展示了一个明显的周期特性.
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